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authorVasant Hegde <hegdevasant@linux.vnet.ibm.com>2016-01-21 21:45:31 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2016-01-25 16:31:13 +1100
commite256caa7d0515e301f8c8c6e7d1204a2b67b1381 (patch)
treedf649e11ac264790fb1cecaf96cb13d58fd22150 /arch/powerpc
parent0e2bce7411542fa336ef49041471ea3e7dc911f8 (diff)
downloadlinux-e256caa7d0515e301f8c8c6e7d1204a2b67b1381.tar.bz2
powerpc/mm: Allow user space to map rtas_rmo_buf
With commit 90a545e9 (restrict /dev/mem to idle io memory ranges) mapping rtas_rmo_buf from user space is failing. Hence we are not able to make RTAS syscall. This patch calls page_is_rtas_user_buf before calling iomem_is_exclusive in devmem_is_allowed(). This will allow user space to map rtas_rmo_buf and we are able to make RTAS syscall. Reported-by: Bharata B Rao <bharata@linux.vnet.ibm.com> CC: Nathan Fontenot <nfont@linux.vnet.ibm.com> Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com> Acked-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/mm/mem.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 22d94c3e6fc4..d0f0a514b04e 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -560,12 +560,12 @@ subsys_initcall(add_system_ram_resources);
*/
int devmem_is_allowed(unsigned long pfn)
{
+ if (page_is_rtas_user_buf(pfn))
+ return 1;
if (iomem_is_exclusive(PFN_PHYS(pfn)))
return 0;
if (!page_is_ram(pfn))
return 1;
- if (page_is_rtas_user_buf(pfn))
- return 1;
return 0;
}
#endif /* CONFIG_STRICT_DEVMEM */